[M] Change in coreboot[master]: soc/intel/cmn/block/{pcie/rtd3,usb4}: Use helper functions for _DSD

[Eric Lai (Code Review)]

Attention is currently required from: Eran Mitrani, Kapil Porwal, Nick Vaccaro.

Eric Lai has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/70065 )

Change subject: soc/intel/cmn/block/{pcie/rtd3,usb4}: Use helper functions for _DSD
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Patch Set 6: Code-Review+2